1 /* 2 * ASoC audio graph sound card support 3 * 4 * Copyright (C) 2016 Renesas Solutions Corp. 5 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> 6 * 7 * based on ${LINUX}/sound/soc/generic/simple-card.c 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 #include <linux/clk.h> 14 #include <linux/device.h> 15 #include <linux/gpio.h> 16 #include <linux/gpio/consumer.h> 17 #include <linux/module.h> 18 #include <linux/of.h> 19 #include <linux/of_device.h> 20 #include <linux/of_gpio.h> 21 #include <linux/of_graph.h> 22 #include <linux/platform_device.h> 23 #include <linux/string.h> 24 #include <sound/jack.h> 25 #include <sound/simple_card_utils.h> 26 27 struct graph_card_data { 28 struct snd_soc_card snd_card; 29 struct graph_dai_props { 30 struct asoc_simple_dai cpu_dai; 31 struct asoc_simple_dai codec_dai; 32 } *dai_props; 33 struct snd_soc_dai_link *dai_link; 34 struct gpio_desc *pa_gpio; 35 }; 36 37 static int asoc_graph_card_outdrv_event(struct snd_soc_dapm_widget *w, 38 struct snd_kcontrol *kcontrol, 39 int event) 40 { 41 struct snd_soc_dapm_context *dapm = w->dapm; 42 struct graph_card_data *priv = snd_soc_card_get_drvdata(dapm->card); 43 44 switch (event) { 45 case SND_SOC_DAPM_POST_PMU: 46 gpiod_set_value_cansleep(priv->pa_gpio, 1); 47 break; 48 case SND_SOC_DAPM_PRE_PMD: 49 gpiod_set_value_cansleep(priv->pa_gpio, 0); 50 break; 51 default: 52 return -EINVAL; 53 } 54 55 return 0; 56 } 57 58 static const struct snd_soc_dapm_widget asoc_graph_card_dapm_widgets[] = { 59 SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM, 60 0, 0, NULL, 0, asoc_graph_card_outdrv_event, 61 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD), 62 }; 63 64 #define graph_priv_to_card(priv) (&(priv)->snd_card) 65 #define graph_priv_to_props(priv, i) ((priv)->dai_props + (i)) 66 #define graph_priv_to_dev(priv) (graph_priv_to_card(priv)->dev) 67 #define graph_priv_to_link(priv, i) (graph_priv_to_card(priv)->dai_link + (i)) 68 69 static int asoc_graph_card_startup(struct snd_pcm_substream *substream) 70 { 71 struct snd_soc_pcm_runtime *rtd = substream->private_data; 72 struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card); 73 struct graph_dai_props *dai_props = graph_priv_to_props(priv, rtd->num); 74 int ret; 75 76 ret = asoc_simple_card_clk_enable(&dai_props->cpu_dai); 77 if (ret) 78 return ret; 79 80 ret = asoc_simple_card_clk_enable(&dai_props->codec_dai); 81 if (ret) 82 asoc_simple_card_clk_disable(&dai_props->cpu_dai); 83 84 return ret; 85 } 86 87 static void asoc_graph_card_shutdown(struct snd_pcm_substream *substream) 88 { 89 struct snd_soc_pcm_runtime *rtd = substream->private_data; 90 struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card); 91 struct graph_dai_props *dai_props = graph_priv_to_props(priv, rtd->num); 92 93 asoc_simple_card_clk_disable(&dai_props->cpu_dai); 94 95 asoc_simple_card_clk_disable(&dai_props->codec_dai); 96 } 97 98 static const struct snd_soc_ops asoc_graph_card_ops = { 99 .startup = asoc_graph_card_startup, 100 .shutdown = asoc_graph_card_shutdown, 101 }; 102 103 static int asoc_graph_card_dai_init(struct snd_soc_pcm_runtime *rtd) 104 { 105 struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card); 106 struct snd_soc_dai *codec = rtd->codec_dai; 107 struct snd_soc_dai *cpu = rtd->cpu_dai; 108 struct graph_dai_props *dai_props = 109 graph_priv_to_props(priv, rtd->num); 110 int ret; 111 112 ret = asoc_simple_card_init_dai(codec, &dai_props->codec_dai); 113 if (ret < 0) 114 return ret; 115 116 ret = asoc_simple_card_init_dai(cpu, &dai_props->cpu_dai); 117 if (ret < 0) 118 return ret; 119 120 return 0; 121 } 122 123 static int asoc_graph_card_dai_link_of(struct device_node *cpu_port, 124 struct graph_card_data *priv, 125 int idx) 126 { 127 struct device *dev = graph_priv_to_dev(priv); 128 struct snd_soc_dai_link *dai_link = graph_priv_to_link(priv, idx); 129 struct graph_dai_props *dai_props = graph_priv_to_props(priv, idx); 130 struct asoc_simple_dai *cpu_dai = &dai_props->cpu_dai; 131 struct asoc_simple_dai *codec_dai = &dai_props->codec_dai; 132 struct device_node *cpu_ep = of_get_next_child(cpu_port, NULL); 133 struct device_node *codec_ep = of_graph_get_remote_endpoint(cpu_ep); 134 struct device_node *rcpu_ep = of_graph_get_remote_endpoint(codec_ep); 135 int ret; 136 137 if (rcpu_ep != cpu_ep) { 138 dev_err(dev, "remote-endpoint mismatch (%s/%s/%s)\n", 139 cpu_ep->name, codec_ep->name, rcpu_ep->name); 140 ret = -EINVAL; 141 goto dai_link_of_err; 142 } 143 144 ret = asoc_simple_card_parse_daifmt(dev, cpu_ep, codec_ep, 145 NULL, &dai_link->dai_fmt); 146 if (ret < 0) 147 goto dai_link_of_err; 148 149 /* 150 * we need to consider "mclk-fs" around here 151 * see simple-card 152 */ 153 154 ret = asoc_simple_card_parse_graph_cpu(cpu_ep, dai_link); 155 if (ret < 0) 156 goto dai_link_of_err; 157 158 ret = asoc_simple_card_parse_graph_codec(codec_ep, dai_link); 159 if (ret < 0) 160 goto dai_link_of_err; 161 162 ret = asoc_simple_card_of_parse_tdm(cpu_ep, cpu_dai); 163 if (ret < 0) 164 goto dai_link_of_err; 165 166 ret = asoc_simple_card_of_parse_tdm(codec_ep, codec_dai); 167 if (ret < 0) 168 goto dai_link_of_err; 169 170 ret = asoc_simple_card_parse_clk_cpu(dev, cpu_ep, dai_link, cpu_dai); 171 if (ret < 0) 172 goto dai_link_of_err; 173 174 ret = asoc_simple_card_parse_clk_codec(dev, codec_ep, dai_link, codec_dai); 175 if (ret < 0) 176 goto dai_link_of_err; 177 178 ret = asoc_simple_card_canonicalize_dailink(dai_link); 179 if (ret < 0) 180 goto dai_link_of_err; 181 182 ret = asoc_simple_card_set_dailink_name(dev, dai_link, 183 "%s-%s", 184 dai_link->cpu_dai_name, 185 dai_link->codec_dai_name); 186 if (ret < 0) 187 goto dai_link_of_err; 188 189 dai_link->ops = &asoc_graph_card_ops; 190 dai_link->init = asoc_graph_card_dai_init; 191 192 asoc_simple_card_canonicalize_cpu(dai_link, 193 of_graph_get_endpoint_count(dai_link->cpu_of_node) == 1); 194 195 dai_link_of_err: 196 of_node_put(cpu_ep); 197 of_node_put(rcpu_ep); 198 of_node_put(codec_ep); 199 200 return ret; 201 } 202 203 static int asoc_graph_card_parse_of(struct graph_card_data *priv) 204 { 205 struct of_phandle_iterator it; 206 struct device *dev = graph_priv_to_dev(priv); 207 struct snd_soc_card *card = graph_priv_to_card(priv); 208 struct device_node *node = dev->of_node; 209 int rc, idx = 0; 210 int ret; 211 212 ret = asoc_simple_card_of_parse_widgets(card, NULL); 213 if (ret < 0) 214 return ret; 215 216 ret = asoc_simple_card_of_parse_routing(card, NULL, 1); 217 if (ret < 0) 218 return ret; 219 220 /* 221 * we need to consider "mclk-fs" around here 222 * see simple-card 223 */ 224 225 of_for_each_phandle(&it, rc, node, "dais", NULL, 0) { 226 ret = asoc_graph_card_dai_link_of(it.node, priv, idx++); 227 if (ret < 0) { 228 of_node_put(it.node); 229 230 return ret; 231 } 232 } 233 234 return asoc_simple_card_parse_card_name(card, NULL); 235 } 236 237 static int asoc_graph_get_dais_count(struct device *dev) 238 { 239 struct of_phandle_iterator it; 240 struct device_node *node = dev->of_node; 241 int count = 0; 242 int rc; 243 244 of_for_each_phandle(&it, rc, node, "dais", NULL, 0) 245 count++; 246 247 return count; 248 } 249 250 static int asoc_graph_card_probe(struct platform_device *pdev) 251 { 252 struct graph_card_data *priv; 253 struct snd_soc_dai_link *dai_link; 254 struct graph_dai_props *dai_props; 255 struct device *dev = &pdev->dev; 256 struct snd_soc_card *card; 257 int num, ret; 258 259 /* Allocate the private data and the DAI link array */ 260 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 261 if (!priv) 262 return -ENOMEM; 263 264 num = asoc_graph_get_dais_count(dev); 265 if (num == 0) 266 return -EINVAL; 267 268 dai_props = devm_kzalloc(dev, sizeof(*dai_props) * num, GFP_KERNEL); 269 dai_link = devm_kzalloc(dev, sizeof(*dai_link) * num, GFP_KERNEL); 270 if (!dai_props || !dai_link) 271 return -ENOMEM; 272 273 priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW); 274 if (IS_ERR(priv->pa_gpio)) { 275 ret = PTR_ERR(priv->pa_gpio); 276 dev_err(dev, "failed to get amplifier gpio: %d\n", ret); 277 return ret; 278 } 279 280 priv->dai_props = dai_props; 281 priv->dai_link = dai_link; 282 283 /* Init snd_soc_card */ 284 card = graph_priv_to_card(priv); 285 card->owner = THIS_MODULE; 286 card->dev = dev; 287 card->dai_link = dai_link; 288 card->num_links = num; 289 card->dapm_widgets = asoc_graph_card_dapm_widgets; 290 card->num_dapm_widgets = ARRAY_SIZE(asoc_graph_card_dapm_widgets); 291 292 ret = asoc_graph_card_parse_of(priv); 293 if (ret < 0) { 294 if (ret != -EPROBE_DEFER) 295 dev_err(dev, "parse error %d\n", ret); 296 goto err; 297 } 298 299 snd_soc_card_set_drvdata(card, priv); 300 301 ret = devm_snd_soc_register_card(dev, card); 302 if (ret < 0) 303 goto err; 304 305 return 0; 306 err: 307 asoc_simple_card_clean_reference(card); 308 309 return ret; 310 } 311 312 static int asoc_graph_card_remove(struct platform_device *pdev) 313 { 314 struct snd_soc_card *card = platform_get_drvdata(pdev); 315 316 return asoc_simple_card_clean_reference(card); 317 } 318 319 static const struct of_device_id asoc_graph_of_match[] = { 320 { .compatible = "audio-graph-card", }, 321 {}, 322 }; 323 MODULE_DEVICE_TABLE(of, asoc_graph_of_match); 324 325 static struct platform_driver asoc_graph_card = { 326 .driver = { 327 .name = "asoc-audio-graph-card", 328 .pm = &snd_soc_pm_ops, 329 .of_match_table = asoc_graph_of_match, 330 }, 331 .probe = asoc_graph_card_probe, 332 .remove = asoc_graph_card_remove, 333 }; 334 module_platform_driver(asoc_graph_card); 335 336 MODULE_ALIAS("platform:asoc-audio-graph-card"); 337 MODULE_LICENSE("GPL v2"); 338 MODULE_DESCRIPTION("ASoC Audio Graph Sound Card"); 339 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); 340